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通过两榀比例为1/3的钢筋混凝土L形截面柱框架结构在反复荷载作用下的试验,研究了L形截面柱框架结构的破坏特征、滞回特性、梁柱出铰顺序、结构整体刚度与层间刚度、耗能性能、延性及异形柱截面中和轴变化规律等,分析了框架整体及L形柱的扭转效应。研究结果表明:L形截面柱框架的破坏属于“强柱弱梁”型,抗震性能较好,框架扭转效应较小,可忽略;结构的位移延性系数满足抗震规范的要求;在屈服荷载前异形柱的截面变形符合平截面假定。
Through the test of L-section RC column frame structure under the action of repeated load, the damage characteristics, the hysteresis characteristics, the hinge sequence of column-column, the overall stiffness of the structure And between layer stiffness, energy dissipation performance, ductility and the variation of the neutral axis of the cross section of the special-shaped column, the torsional effects of the whole frame and the L-shaped column are analyzed. The results show that the failure of the L-shaped cross-section column frame belongs to the type of “strong column weak beam”, and the seismic performance is good, the torsional effect of the frame is small and negligible; the displacement ductility coefficient of the structure meets the requirements of the seismic code; The cross-section deformation of the front special-shaped column conforms to the assumption of flat section.